Thank you so much for your suggestions, I 've the same opinion on Wallps and sigs

I do wallpapers for friends generally, and I try to accomplish their tastes, though I use dark or restful colors (black, dull blue ecc) most of the times.
A question: I use to put in (when the situation requires to) figures like anime charachters and so on, but usually I try to make them half-transparent or something this way, in order to make the wallp not intrusive for the desktop.
Shall I do the opposit, in order to enhance the image (as I can see in many wallpaper) ?
I've also posted a couple of works I did, My first wallpaper and one of my first layouts in the showroom forum.